555 Timer Oscillator

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555 Timer Oscillator

Features:

Synthrotek’s 555 Timer has endless usage! Use it as an LFO to modify existing noise making machines or use it as a stand alone tone generator or a clock. Adding this PCB to our PT2399 delay on pin 6 has been super awesome. (A MUST FOR CIRCUIT BENDERS) Many other ideas… Kit includes everything you need to make a variable pulse generator. Comes with 9V battery clip; use it stand alone or wire it up to your existing circuit.

Frequency range: ~10Hz-46Hz. The chip can go as high as 2.1MHz by modifying the components!

Hi Patrick, I am actually working on a tremolo right now with a buddy. Well, part of the trem circuit is an LFO to an LED or optioisolator. I think it could work, please let me know know what you come up with!

Hey man, thanks for getting back to me. I think i’ve figured out how to do this now (with a lot of help from some very nice people on various forums).
Basically i’m going to build this:http://farm4.static.flickr.com/3592/3775341040_25d6e90ca8_o.jpg
and replace the feedback pot with a vactrol which will be linked to this:http://mikmo.dk/cblfo.html
The way i understand it, the LED which is made to flash by the LFO circuit passes through the photoresistor and creates the tremolo effect on the feedback looper. That’s correct as far as i know. I was wondering if i could replace the LFO circuit on the milkmo site with this one…although as silly as it sounds i can’t actually work where the LED would be wired to on this circuit.
Cheers
Patrick

Hmm, on that flikcr circuit does not really seem to have an oscillator circuit in it… My 555 would do something similar as the mikmo deal. Just outputs a variable square wave, could light up the LED, then I guess you would need a optical resistor to read that LED to vary the resistance.

Hey Ian,
You should be able to wire a 3.5mm mono jack to the output of the 555 timer. Unless I’m not understanding what you are saying, the way to wire it is in the assembly instruction.
With regards to making a CV input, pin 5 is the Control pin. Instead of populating C3 with a capacitor, you will want to wire your 3.5mm jack into that spot. The tip of the jack should be wired to the via on the right (its the via with CV printed next to it) and the shield or ground of the jack to the via on the left.
Good luck!
-Zach

Hey! Great kit – very fast build. A couple of questions… I’ve hunted around the web but I can’t find a decent explanation.
1. Do I need to mod it if I want to use it as an LFO? If so how?
2. If I want to connect an LED to indicate the LFO rate how would I do that?
Thanks!